Qhov sib txawv ntawm gametic sporic thiab zygotic meiosis yog gametic meiosis yog meiosis uas tshwm sim thaum lub sij hawm tsim ntawm txiv neej thiab poj niam gametes thaum sporic meiosis yog meiosis uas tshwm sim thaum lub sij hawm sporogenesis thiab zygotic meiosis yog meiosis uas tshwm sim. hauv zygote.
Feem ntau lub neej muaj xws li ob theem haploid thiab diploid. Txhawm rau rov qab los ntawm theem diploid mus rau theem haploid, meiosis yog qhov tseem ceeb. Meiosis yog ib qho ntawm ob hom kev faib cell. Diploid hlwb faib los ntawm meiosis thiab tsim cov hlwb haploid uas tsuas muaj ib pawg chromosomes xwb. Los ntawm ib lub cell, plaub tus ntxhais cell yog tsim los ntawm meiosis. Qhov tseem ceeb tshaj plaws, thaum lub sij hawm meiosis, genetic recombination tshwm sim. Yog li ntawd, tus ntxhais cell yog genetic txawv ntawm niam txiv cell. Genetic recombination yog ib qho tseem ceeb ntawm evolutionary txheej txheem. Meiosis tshwm sim los ntawm ob txoj kev sib txuas meiosis: meiosis I thiab meiosis II. Thaum lub sij hawm lub neej ntawm ib tug kab mob, meiosis tshwm sim nyob rau hauv thiaj li yuav tsim gametes, spores thiab kuj rau zygote division.
Gametic Meiosis yog dab tsi?
Gametes yog txiv neej thiab poj niam lub hlwb ntawm cov kab mob. Lawv yog cov hlwb haploid uas tsuas muaj ib pawg chromosomes xwb. Poj niam gametes nqa ib nrab ntawm niam chromosomes thaum txiv neej gametes nqa ib nrab ntawm leej txiv chromosomes. Lawv sib txuas nrog ib leeg txhawm rau ua kom lub diploid zygote. Yog li ntawd, meiosis yuav tsum muaj qhov chaw los ua cov hlwb haploid los ntawm cov hlwb diploid. Meiosis yuav xyuas kom meej tias gametes tau txais ib qho chromosomes nkaus xwb. Lub meiosis uas tshwm sim thaum lub sij hawm tsim ntawm gametes yog hu ua gametic meiosis.
Daim duab 01: Gametic Meiosis
Sporic Meiosis yog dab tsi?
Sporic meiosis yog kev faib cov cell meiotic uas tshwm sim thaum lub sijhawm sporogenesis. Sporogenesis yog hais txog cov txheej txheem uas tsim cov spores. Feem ntau, cov nroj tsuag, algae thiab fungi tsim spores thiaj li yug me nyuam. Li no, sporogenesis yog ib theem thaum lawv lub neej voj voog. Thaum lawv tsim spores, meiotic cell division tshwm sim. Sporic meiosis yog ib qho xwm txheej tseem ceeb hauv kev sib deev thiab pab ua kom tiav lawv lub neej. Hauv qee cov kab mob, sporogenesis yog nrog los ntawm mitosis thaum tsim cov spores asexual. Hauv qee cov kab mob, ob qho tib si meiotic thiab mitotic sporogenesis yuav tsum tau ua kom tiav lawv lub neej voj voog.
Daim duab 02: Sporic Meiosis
Nyob rau hauv sporic meiosis, ib tug diploid spore niam cell, uas nyob rau hauv lub sporangium, undergoes meiosis. Nws ua rau plaub haploid spores. Hauv cov kab mob heterosporous, ob hom spores yog tsim los ntawm sporic meiosis: microspores thiab megaspores. Nyob rau hauv flowering nroj tsuag, microspores yog tsim nyob rau hauv anthers ntawm paj. Hauv conifers, sporic meiosis tshwm sim hauv microsrobili thiab megastrobili thaum tsim microspores thiab megaspores.
Zygotic Meiosis yog dab tsi?
Zygote yog ib lub cell diploid tsim los ntawm kev sib xyaw ntawm ob lub hlwb sib txawv. Hauv qee yam kab mob xws li cellular slime pwm thiab dinoflagellates, zygote tau dhau los ua meiosis los tsim cov neeg haploid. Yog li, zygotic meiosis hais txog kev faib cov zygote los ntawm meiosis los tsim cov hlwb haploid uas tsim cov neeg haploid. Hauv cov lus yooj yim, zygotic meiosis yog hom kev faib cell uas tsim cov hlwb haploid los ntawm zygote. Nyob rau hauv cov kab mob no, tshwj xeeb tshaj yog nyob rau hauv fungi thiab ntsuab algae, lub multicellular theem yog haploid. Yog li ntawd, thaum lub diploid zygote tsim, nws yuav tsum tau mus rau meiosis los tsim haploid spores. Tom qab ntawd, cov haploid spores faib los ntawm mitosis txhawm rau tsim cov neeg muaj ntau lub cellular haploid.
Daim duab 03: Meiosis
Dab tsi zoo sib xws ntawm Gametic Sporic thiab Zygotic Meiosis?
- Txhua peb hom meiosis tsim cov hlwb haploid.
- Lawv yog cov txheej txheem tseem ceeb heev txhawm rau ua kom tiav lawv lub neej.
Qhov txawv ntawm Gametic Sporic thiab Zygotic Meiosis yog dab tsi?
Gametic meiosis tshwm sim thaum gametes tsim thaum sporic meiosis tshwm sim thaum cov spores tsim rau kev sib deev. Meanwhile, nyob rau hauv zygotic meiosis, zygote undergoes meiosis. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm gametic sporic thiab zygotic meiosis. Gametic meiosis yog ib qho tseem ceeb kom tsim tau ib lub cell diploid tom qab fertilization thiab ces ib tug multicellular diploid kab mob. Sporic meiosis yog qhov tseem ceeb hauv kev tsim cov spores haploid kev sib deev rau kev sib deev feem ntau hauv cov nroj tsuag. Zygotic meiosis yog ib qho tseem ceeb rau kev tsim ntawm ntau cov cellular haploid cov neeg xws li fungi thiab ntsuab algae. Yog li, qhov no yog qhov sib txawv ntawm gametic sporic thiab zygotic meiosis.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm gametic sporic thiab zygotic meiosis rau ib sab ntawm kev sib piv.
Summary – Gametic Sporic vs Zygotic Meiosis
Txhua hom muaj tus lej tshwj xeeb ntawm chromosomes hauv lawv cov genome. Cov chromosomes no nqa cov ntaub ntawv caj ces ntawm tus neeg. Yuav kom tswj tau qhov sib xws ntawm tus naj npawb ntawm chromosomes hauv tiam neeg, meiosis tshwm sim. Vim yog meiosis, cov hlwb tau txais ib nrab ntawm tag nrho cov chromosomes. Meiosis pab kev sib deev. Ntxiv mus, meiosis pab tsim cov neeg haploid. Nyob ntawm theem ntawm meiosis tshwm sim, nws tuaj yeem raug cais raws li gametic, sporic thiab zygotic meiosis. Gametic meiosis tshwm sim thaum lub sij hawm gamete tsim thaum sporic meiosis tshwm sim thaum lub sij hawm sporogenesis thiab zygotic meiosis tshwm sim thaum lub sij hawm haploid cell tsim. Yog li, qhov no qhia txog qhov sib txawv ntawm gametic sporic thiab zygotic meiosis.
